After putting the chairs together and using them for 2 days we threw away the shipping boxes. On the fourth day the chairs started "sinking" down constantly needing to be re-adjusted to the desired height. After starting the return process we found out that without the boxes (and disassembling the chairs) we would need to return them to our local Staples store. Not very convenient. My advise would be that if you buy these chairs (not recommended) hold on to the boxes and be prepared to take them apart and return them.